2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file core/gnunet-service-core_neighbours.c
23 * @brief code for managing low-level 'plaintext' connections with transport (key exchange may or may not be done yet)
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_statistics_service.h"
29 #include "gnunet_transport_service.h"
30 #include "gnunet-service-core.h"
31 #include "gnunet-service-core_neighbours.h"
32 #include "gnunet-service-core_kx.h"
33 #include "gnunet-service-core_sessions.h"
34 #include "gnunet_constants.h"
38 * Message ready for transmission via transport service. This struct
39 * is followed by the actual content of the message.
41 struct NeighbourMessageEntry
45 * We keep messages in a doubly linked list.
47 struct NeighbourMessageEntry *next;
50 * We keep messages in a doubly linked list.
52 struct NeighbourMessageEntry *prev;
55 * By when are we supposed to transmit this message?
57 struct GNUNET_TIME_Absolute deadline;
60 * How long is the message? (number of bytes following the "struct
61 * MessageEntry", but not including the size of "struct
62 * MessageEntry" itself!)
70 * Data kept per transport-connected peer.
76 * Head of the batched message queue (already ordered, transmit
77 * starting with the head).
79 struct NeighbourMessageEntry *message_head;
82 * Tail of the batched message queue (already ordered, append new
85 struct NeighbourMessageEntry *message_tail;
88 * Handle for pending requests for transmission to this peer
89 * with the transport service. NULL if no request is pending.
91 struct GNUNET_TRANSPORT_TransmitHandle *th;
94 * Information about the key exchange with the other peer.
96 struct GSC_KeyExchangeInfo *kxinfo;
99 * Identity of the other peer.
101 struct GNUNET_PeerIdentity peer;
104 * ID of task used for re-trying plaintext scheduling.
106 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
112 * Map of peer identities to 'struct Neighbour'.
114 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
119 static struct GNUNET_TRANSPORT_Handle *transport;
123 * Find the entry for the given neighbour.
125 * @param peer identity of the neighbour
126 * @return NULL if we are not connected, otherwise the
129 static struct Neighbour *
130 find_neighbour (const struct GNUNET_PeerIdentity *peer)
132 return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
137 * Free the given entry for the neighbour.
139 * @param n neighbour to free
142 free_neighbour (struct Neighbour *n)
144 struct NeighbourMessageEntry *m;
147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
148 "Destroying neighbour entry for peer `%4s'\n",
149 GNUNET_i2s (&n->peer));
151 while (NULL != (m = n->message_head))
153 GNUNET_CONTAINER_DLL_remove (n->message_head, n->message_tail, m);
158 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
161 GNUNET_STATISTICS_update (GSC_stats,
162 gettext_noop ("# sessions terminated by transport disconnect"),
165 GSC_SESSIONS_end (&n->peer);
166 if (NULL != n->kxinfo)
168 GSC_KX_stop (n->kxinfo);
171 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
173 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
174 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
176 GNUNET_assert (GNUNET_OK ==
177 GNUNET_CONTAINER_multihashmap_remove (neighbours,
178 &n->peer.hashPubKey, n));
179 GNUNET_STATISTICS_set (GSC_stats, gettext_noop ("# neighbour entries allocated"),
180 GNUNET_CONTAINER_multihashmap_size (neighbours),
187 * Check if we have encrypted messages for the specified neighbour
188 * pending, and if so, check with the transport about sending them
191 * @param n neighbour to check.
194 process_queue (struct Neighbour *n);
198 * Function called when the transport service is ready to receive a
199 * message for the respective peer
201 * @param cls neighbour to use message from
202 * @param size number of bytes we can transmit
203 * @param buf where to copy the message
204 * @return number of bytes transmitted
207 transmit_ready (void *cls, size_t size, void *buf)
209 struct Neighbour *n = cls;
210 struct NeighbourMessageEntry *m;
221 GNUNET_CONTAINER_DLL_remove (n->message_head, n->message_tail, m);
225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
226 "Transmission of message of type %u and size %u failed\n",
228 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
229 (unsigned int) m->size);
237 GNUNET_assert (size >= m->size);
238 memcpy (cbuf, &m[1], m->size);
241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
242 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
244 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
245 (unsigned int) ret, GNUNET_i2s (&n->peer));
249 GNUNET_STATISTICS_update (GSC_stats,
251 ("# encrypted bytes given to transport"), ret,
258 * Check if we have messages for the specified neighbour pending, and
259 * if so, check with the transport about sending them out.
261 * @param n neighbour to check.
264 process_queue (struct Neighbour *n)
266 struct NeighbourMessageEntry *m;
269 return; /* request already pending */
273 /* notify sessions that the queue is empty and more messages
274 could thus be queued now */
275 GSC_SESSIONS_solicit (&n->peer);
279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
280 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
281 (unsigned int) m->size, GNUNET_i2s (&n->peer),
283 GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
286 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer, m->size,
288 GNUNET_TIME_absolute_get_remaining
294 /* message request too large or duplicate request */
296 /* discard encrypted message */
297 GNUNET_CONTAINER_DLL_remove (n->message_head, n->message_tail, m);
305 * Function called by transport to notify us that
306 * a peer connected to us (on the network level).
309 * @param peer the peer that connected
310 * @param atsi performance data
311 * @param atsi_count number of entries in ats (excluding 0-termination)
314 handle_transport_notify_connect (void *cls,
315 const struct GNUNET_PeerIdentity *peer,
316 const struct GNUNET_ATS_Information
317 *atsi, uint32_t atsi_count)
321 if (0 == memcmp (peer, &GSC_my_identity, sizeof (struct GNUNET_PeerIdentity)))
326 n = find_neighbour (peer);
329 /* duplicate connect notification!? */
334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received connection from `%4s'.\n",
337 n = GNUNET_malloc (sizeof (struct Neighbour));
339 GNUNET_assert (GNUNET_OK ==
340 GNUNET_CONTAINER_multihashmap_put (neighbours,
341 &n->peer.hashPubKey, n,
342 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
343 GNUNET_STATISTICS_set (GSC_stats, gettext_noop ("# neighbour entries allocated"),
344 GNUNET_CONTAINER_multihashmap_size (neighbours),
346 n->kxinfo = GSC_KX_start (peer);
351 * Function called by transport telling us that a peer
355 * @param peer the peer that disconnected
358 handle_transport_notify_disconnect (void *cls,
359 const struct GNUNET_PeerIdentity *peer)
364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
365 "Peer `%4s' disconnected from us; received notification from transport.\n",
368 n = find_neighbour (peer);
379 * Function called by the transport for each received message.
382 * @param peer (claimed) identity of the other peer
383 * @param message the message
384 * @param atsi performance data
385 * @param atsi_count number of entries in ats (excluding 0-termination)
388 handle_transport_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
389 const struct GNUNET_MessageHeader *message,
390 const struct GNUNET_ATS_Information *atsi,
397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
398 "Received message of type %u from `%4s', demultiplexing.\n",
399 (unsigned int) ntohs (message->type), GNUNET_i2s (peer));
401 if (0 == memcmp (peer, &GSC_my_identity, sizeof (struct GNUNET_PeerIdentity)))
406 n = find_neighbour (peer);
409 /* received message from peer that is not connected!? */
413 type = ntohs (message->type);
416 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
417 GSC_KX_handle_set_key (n->kxinfo, message);
419 case GNUNET_MESSAGE_TYPE_CORE_PING:
420 GSC_KX_handle_ping (n->kxinfo, message);
422 case GNUNET_MESSAGE_TYPE_CORE_PONG:
423 GSC_KX_handle_pong (n->kxinfo, message);
425 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
426 GSC_KX_handle_encrypted_message (n->kxinfo,
431 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
432 _("Unsupported message of type %u received.\n"),
433 (unsigned int) type);
440 * Transmit the given message to the given target.
442 * @param target peer that should receive the message (must be connected)
443 * @param msg message to transmit
444 * @param timeout by when should the transmission be done?
447 GSC_NEIGHBOURS_transmit (const struct GNUNET_PeerIdentity *target,
448 const struct GNUNET_MessageHeader *msg,
449 struct GNUNET_TIME_Relative timeout)
451 struct NeighbourMessageEntry *me;
455 n = find_neighbour (target);
461 msize = ntohs (msg->size);
462 me = GNUNET_malloc (sizeof (struct NeighbourMessageEntry) + msize);
463 me->deadline = GNUNET_TIME_relative_to_absolute (timeout);
465 memcpy (&me[1], msg, msize);
466 GNUNET_CONTAINER_DLL_insert_tail (n->message_head,
474 * Initialize neighbours subsystem.
477 GSC_NEIGHBOURS_init ()
479 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
481 GNUNET_TRANSPORT_connect (GSC_cfg,
482 &GSC_my_identity, NULL,
483 &handle_transport_receive,
484 &handle_transport_notify_connect,
485 &handle_transport_notify_disconnect);
486 if (NULL == transport)
488 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
490 return GNUNET_SYSERR;
497 * Wrapper around 'free_neighbour'.
500 * @param key peer identity
501 * @param value the 'struct Neighbour' to free
502 * @return GNUNET_OK (continue to iterate)
505 free_neighbour_helper (void *cls, const GNUNET_HashCode * key, void *value)
507 struct Neighbour *n = value;
509 /* transport should have 'disconnected' all neighbours... */
517 * Shutdown neighbours subsystem.
520 GSC_NEIGHBOURS_done ()
522 if (NULL == transport)
524 GNUNET_TRANSPORT_disconnect (transport);
526 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
528 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
532 /* end of gnunet-service-core_neighbours.c */